Android开发初体验

1.搭建工程

2.开发初体验

1.点击MainActivity.java 。注意事项如图及代码 ↓,

MainActivity.java 代码↓

package com.example.geoquiz;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends AppCompatActivity {  private Button mTrueButton; //添加两个按钮成员变量，m开头表示menmber成员变量  private Button mFalseButton;  @Override  protected void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      setContentView(R.layout.activity_main);      mTrueButton = (Button) findViewById(R.id.true_button);//引用组件      //为按钮设置监听器，使用匿名内部类      mTrueButton.setOnClickListener(new View.OnClickListener() {          @Override          public void onClick(View view) {              //创建提示消息              Toast.makeText(MainActivity.this,R.string.incorrect_toast,Toast.LENGTH_SHORT).show();          }      });      mFalseButton = (Button) findViewById(R.id.false_button);      mFalseButton.setOnClickListener(new View.OnClickListener() {          @Override          public void onClick(View view) {              Toast.makeText(MainActivity.this,R.string.correct_toast,                      Toast.LENGTH_SHORT).show();          }      });  }}

2.activity_main.xml ↓

activity_main.xml代码↓

3.strings.xml ↓

strings.xml 代码 ↓


         
      
       GeoQuiz
          
      
               Constantinople is the largest city in Turkey.    
          
      
       TRUE
          
      
       FALSE
          
      
       Incorrect!
          
      
       correct